I have experienced the same error.  
It is because the border is not being added correctly.  But it WILL happen
when you added it as described in the wiki
http://www.wicket-wiki.org.uk/wiki/index.php/Migrate-1.2
The page renders correctly however when an ajax request is send the markup
id does not matching the component map id. Then an infinite loop occurs in 
public abstract class Component implements Serializable
        private final MarkupStream initializeMarkupStream()
                        ....
                      while (markupStream == null)
 
Presently my work around is to have my applications base page class from
which all pages are entered from include not just 
                border = new foo.Border("border");
                border.setTransparentResolver(true);
                super.add(border);
as show in the wicket but I override the add with

        public MarkupContainer add(Component arg0) {
                if(border==null)
                        return super.add(arg0);
                else{
                        border.add(arg0);
                                                return this;
                                }
        }


The infinite loop needs to be resolved/trapped and I'm not sure that
wicket.markup.html.border.Border is behaving as expected since my override
with the add is part of how the border worked in 1.1 which perhaps
border.setTransparentResolver(true); was supposed to change/handle???

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